package com.sky.service.impl;

import com.github.pagehelper.Page;
import com.github.pagehelper.PageHelper;
import com.github.xiaoymin.knife4j.core.io.VFS;
import com.sky.constant.MessageConstant;
import com.sky.constant.StatusConstant;
import com.sky.context.BaseContext;
import com.sky.dto.DishDTO;
import com.sky.dto.DishPageQueryDTO;
import com.sky.entity.Category;
import com.sky.entity.Dish;
import com.sky.entity.DishFlavor;
import com.sky.exception.BaseException;
import com.sky.exception.DeletionNotAllowedException;
import com.sky.mapper.CategoryMapper;
import com.sky.mapper.DishFlavorMapper;
import com.sky.mapper.DishMapper;
import com.sky.mapper.SetmealDishMapper;
import com.sky.result.PageResult;
import com.sky.service.DishService;
import com.sky.vo.DishVO;
import org.springframework.beans.BeanUtils;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Service;
import org.springframework.transaction.annotation.Transactional;

import java.time.LocalDateTime;
import java.util.ArrayList;
import java.util.List;

@Service
public class DishServiceImpl implements DishService {
    @Autowired
    private DishMapper dishMapper;
    @Autowired
    private DishFlavorMapper dishFlavorMapper;
    @Autowired
    private SetmealDishMapper setmealDishMapper;

    @Autowired
    private CategoryMapper categoryMapper;
    /**
     * 新增菜品
     * @param dishDTO
     */
    @Transactional
    @Override
    public void saveWithFlavor(DishDTO dishDTO) {
        Dish dish=new Dish();
        BeanUtils.copyProperties(dishDTO,dish);
        //向菜品表dish插入1条数据
        dishMapper.insert(dish);

        //获取菜品的主键值
        Long dishId = dish.getId();

        List<DishFlavor> flavors=dishDTO.getFlavors();
        if(flavors != null && flavors.size() > 0){
            //向口味表dish_flavor插入n条
            flavors.forEach(dishFlavor -> {
                dishFlavor.setDishId(dishId);
            });
            //批量插入
            dishFlavorMapper.insertBatch(flavors);
        }
    }

    /**
     * 菜品分页查询
     * @param dishPageQueryDTO
     * @return
     */
    @Override

    public PageResult pageQuery(DishPageQueryDTO dishPageQueryDTO) {
        PageHelper.startPage(dishPageQueryDTO.getPage(),dishPageQueryDTO.getPageSize());
        Page<DishVO> page=dishMapper.pageQuery(dishPageQueryDTO);
        return new PageResult(page.getTotal(),page.getResult());
    }

    /**
     * 根据id查询菜品和关联的口味数据
     * * @param id
     * * @return
     * */
    @Override
    @Transactional
    public DishVO getByIdWithFlavor(Long id) {
        //根据id查询菜品表
        Dish dish=dishMapper.getById(id);
        //查询关联的口味
        List<DishFlavor>flavors=dishFlavorMapper.getByDishId(id);
        //封装成VO
        DishVO dishVO=new DishVO();
        BeanUtils.copyProperties(dish,dishVO);
        dishVO.setFlavors(flavors);

        return dishVO;
    }

    /**
     * 根据分类id查询菜品和关联的口味数据
     *  @param list
     * @return
     * */
    @Override
    public List<DishVO> getlist(Long list) {

        return dishMapper.getlist(list);
    }

    /**
     * 修改菜品
     * @param dishDTO
     * @return
     */
    @Override
    @Transactional
    public void updateWithFlavor(DishDTO dishDTO) {
        Dish dish = new Dish();
        BeanUtils.copyProperties(dishDTO,dish);

        //修改菜品表dish，执行update操作
        dish.setUpdateTime(LocalDateTime.now());
        dish.setUpdateUser(BaseContext.getCurrentId());
        dishMapper.update(dish);

        //删除当前菜品关联的口味数据，操作dish_flavor，执行delete操作
        dishFlavorMapper.deleteByDishId(dishDTO.getId());

        //插入最新的口味数据，操作dish_flavor，执行insert操作
        List<DishFlavor>flavors=dishDTO.getFlavors();
        if (flavors!=null&&flavors.size()>0){
        flavors.forEach(dishFlavor -> {
        dishFlavor.setDishId(dishDTO.getId());
       });
       }
        dishFlavorMapper.insertBatch(flavors);
    }


    /**
     * 根据id删除菜品和关联的口味数据
     *  @param ids
     * @return
     * */
    @Override
    @Transactional
    //事务注解，要么全成功，要么全失败
    public void delete(List<Long> ids) {
        //判断当前菜品是否能够删除-是否存在起售的商品??
        for (Long id:ids) {
            Dish dish=dishMapper.getById(id);
            if (dish.getStatus()== StatusConstant.ENABLE){
                //当前菜品处于起售当中
                throw new DeletionNotAllowedException(MessageConstant.DISH_ON_SALE);
            }
        }
        //判断当前菜品是否能够删除-是否被套餐关联?
        List<Long> stemealIds = setmealDishMapper.getSetmealIdsByDishIds(ids);
           if (stemealIds!=null&&stemealIds.size()>0){
    //当前菜品被套餐关联，不能删除
               throw new DeletionNotAllowedException(MessageConstant.DISH_BE_RELATED_BY_SETMEAL);
        }
        //删除菜品关联的菜品数据
        for (Long id:ids) {
            dishFlavorMapper.deleteByDishId(id);
        }

        //删除菜品表的数据
        dishMapper.delete(ids);
    }

    /** 启用禁用菜品
     *  @param status
     * * @param id
     */
    @Override
    @Transactional
    public void startOrstop(Integer status, long id) {
        Dish dish = Dish.builder().id(id).status(status).build();
        dish.setUpdateUser(BaseContext.getCurrentId());
        dish.setUpdateTime(LocalDateTime.now());
        //先获取dish所有的信息
        Dish dishdemo=dishMapper.getById(id);
        //获取Dish对应的Category对象
        Category category=categoryMapper.getCategory(dishdemo.getCategoryId());
        if (category.getStatus()!=StatusConstant.ENABLE){
            throw new BaseException(MessageConstant.DISH_ENABLE_FAILED);
        }
        dishMapper.update(dish);
    }

    @Override
    @Transactional
    /**
     * 条件查询菜品和口味
     * @param dish
     * @return
     */
    public List<DishVO> listWithFlavor(Dish dish) {
        List<Dish> dishList = dishMapper.list(dish);

        List<DishVO> dishVOList = new ArrayList<>();

        for (Dish d : dishList) {
            DishVO dishVO = new DishVO();
            BeanUtils.copyProperties(d,dishVO);

            //根据菜品id查询对应的口味
            List<DishFlavor> flavors = dishFlavorMapper.getByDishId(d.getId());

            dishVO.setFlavors(flavors);
            dishVOList.add(dishVO);
        }

        return dishVOList;
    }
}
